At the start of Kerin's diet he weighed 13 stone 12 pounds. Three months later he weighed 12 stone 10 pounds. There are 14 pounds in a stone. Calculate the reduction in Kerins weight as a percentage of his inetial weight.

How many liters of peroxide should be added to 12 liters of an 8% peroxide solution so that the resulting solution contains 16% peroxide?   original added new amount of peroxide 0.96 liters x 0.96 + x amount of solution 12 liters x 12 + x 0.18 liter 1.14 liters 1.92 liters 2.10 liters